One possible plot could be that in a world of magic and mystery, Dean's car, which has some sort of enchanted spirit bound to it, starts to exhibit strange behavior. The car begins to glow and hum, and soon enough, there are signs of 'pregnancy' like a warm, pulsating energy from within. Dean has to figure out how to deal with this situation, perhaps seeking help from a local witch or wizard who has knowledge of such strange phenomena.
Maybe the car was exposed to some experimental technology. For example, a scientist was working on a new form of energy transfer that went wrong. The energy somehow interacted with the car in a way that made it seem like it was 'pregnant'. Dean then has to work with the scientist to reverse the process before the car explodes or causes other chaos.
Dean would probably be extremely confused at first. He might stand there, staring at his car with a bewildered look on his face, muttering things like 'This can't be real'.
Well, one possible development could be that Ginny has to deal with the reactions of her family and friends. They might be shocked at first but then come around to support her.
One possible plot could be that in a magical realm where the bond between Toothless and Hiccup is even more profound, an ancient spell or some kind of strange phenomenon causes Hiccup to be able to conceive. Toothless, being extremely protective, would then go to great lengths to keep Hiccup safe during the pregnancy. He might search for special herbs or a safe place for her to give birth. And along the way, they face challenges from those who don't understand this strange occurrence.
One possible plot could be about how they overcome the initial shock and opposition from their friends and the ninja world. Naruto and Sasuke would have to deal with the social implications of their relationship. As Naruto gets pregnant, they might also face concerns about the safety of the unborn child considering their status as powerful ninjas with many enemies.
Well, it might be about a character with some sort of superpower that they can't control. Maybe they have a power of fertility that spreads uncontrollably, thus getting everyone pregnant. Another possibility is that it could be set in a post - apocalyptic world where a new form of radiation has the side - effect of causing pregnancy in all genders.
One possible plot could be about how Michonne adjusts to the news of her pregnancy in a post - apocalyptic world. She might have to deal with finding proper resources for her and the baby's survival.
The plot might involve the father of the baby as well. If the identity of the father is a mystery, Naruko could be on a quest to figure it out. Or if it's someone she knows, they could have different reactions to the news. For example, if it's a love interest, they might be overjoyed or terrified depending on their situation. There could also be elements of how the pregnancy affects Naruko's goals and dreams, whether she has to put them on hold or find a way to pursue them while being pregnant.
One possible plot could be about the challenges Kiba faces during the pregnancy. For example, she might struggle with how to continue her normal life while dealing with the physical changes. Maybe she has to hide it at first from certain people in her life.
Well, one possible plot could be that Korra and Asami decide to start a family together in a modern AU. They face challenges like how to balance their important work with raising a child. Maybe Korra has to deal with her bending powers during pregnancy, like how to control them without endangering the baby.
In a 'naruto gets pregnant fanfiction', perhaps there is a powerful enemy who casts a spell on Naruto. This spell not only endangers his life but also has the side - effect of making him pregnant. The story could then revolve around Naruto trying to find a way to reverse this while also dealing with the reactions of his friends and the village.